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When dawn was breaking the Amazonian city of Belém on Saturday morning, representatives remained stuck in a airless conference room, unaware whether it was day or night. For more than 12 hours in tense discussions, with scores ministers representing multiple blocs of countries from the poorest nations to the wealthiest economies.

Patience wore thin, the air stifling as weary delegates confronted the harsh reality: there would not be a comprehensive agreement in Brazil. The 30th UN climate conference hovered near the brink of complete breakdown.

The major obstacle: Fossil fuels

Research has demonstrated for nearly a century, the carbon dioxide produced by utilizing fossil fuels is warming our planet to dangerous levels.

Yet, during more than three decades of annual climate meetings, the urgent need to cease fossil fuel use has been mentioned only once – in a agreement made two years ago at the Dubai climate summit to "move beyond fossil fuels". Representatives from the Gulf states, Russia, and a few other countries were adamant this would not be repeated.

Growing momentum for change

Simultaneously, a growing number of countries were equally determined that progress on this issue was urgently necessary. They had formulated a initiative that was gathering expanding support and made it clear they were willing to hold firm.

Less wealthy nations urgently needed to advance on securing financial assistance to help them cope with the increasingly severe impacts of extreme weather.

Breaking point

During the night of Saturday, some delegates were prepared to walk out and trigger failure. "The situation was precarious for us," commented one energy minister. "I considered to walk away."

The pivotal moment happened through discussions with Saudi Arabia. Shortly after 6am, principal delegates separated from the main group to hold a closed-door meeting with the lead Saudi negotiator. They encouraged text that would subtly reference the global commitment to "move beyond fossil fuels" made two years earlier in Dubai.

Unexpected agreement

As opposed to explicitly referencing fossil fuels, the text would refer to "the previous commitment". Upon deliberation, the Saudi delegation surprisingly accepted the wording.

The room expressed relief. Celebrations began. The settlement was completed.

With what became known as the "Brazil agreement", the world took a modest advance towards the gradual elimination of fossil fuels – a hesitant, inadequate step that will minimally impact the climate's continued progression towards catastrophe. But nevertheless a significant departure from absolute paralysis.

Major components of the agreement

• In addition to the indirect reference in the legally agreed text, countries will begin work a framework to phase out fossil fuels
• This will be primarily a optional undertaking led by Brazil that will provide updates next year
• Addressing the essential decreases in greenhouse gas emissions to stay within the 1.5C limit was similarly postponed to next year
• Developing countries secured a tripling to $120bn of regular financial support to help them manage the impacts of extreme weather
• This sum will not be delivered in full until 2035
• Workers will benefit from a "just transition mechanism" to help people working in fossil fuel sectors move toward the clean economy

Mixed reactions

With global conditions teeters on the brink of climate "irreversible changes" that could eliminate habitats and force whole regions into crisis, the agreement was not the "significant advancement" needed.

"The summit provided some small advances in the correct path, but considering the scale of the climate crisis, it has fallen short of the occasion," cautioned one environmental analyst.

This flawed deal might have been the best attainable, given the political challenges – including a Washington administration who ignored the talks and remains committed to oil and coal, the rising tide of nationalist politics, persistent fighting in multiple regions, unacceptable degrees of inequality, and global economic volatility.

"Major polluters – the fossil fuel giants – were ultimately in the crosshairs at Cop30," comments one environmental advocate. "This represents progress on that. The opportunity is accessible. Now we must turn it into a real fire escape to a more secure planet."

Deep fissures revealed

Although nations were able to celebrate the gavelling through of the deal, Cop30 also highlighted major disagreements in the primary worldwide framework for addressing the climate crisis.

"Climate conferences are consensus-based, and in a era of geopolitical divides, consensus is increasingly difficult to reach," commented one senior UN official. "I cannot pretend that Cop30 has provided all that is needed. The difference between our current position and what science demands remains concerningly substantial."

When the world is to prevent the gravest consequences of climate breakdown, the UN climate talks alone will not be nearly enough.